<!-- MHonArc v2.4.4 --> <!--X-Subject: [MUD-Dev] Re: META: who are we? --> <!--X-From-R13: Brgev Hvexxhyn <civexxhyNvxv.sv> --> <!--X-Date: Tue, 22 Sep 1998 18:19:50 -0700 --> <!--X-Message-Id: 13832.19623.570964.56394#arioch,tky.hut.fi --> <!--X-Content-Type: text/plain --> <!--X-Reference: KaVir#dial,pipex.com --> <!--X-Reference: 3608983D.756E#dial,pipex.com --> <!--X-Reference: 199809222302.QAA03904#under,engr.sgi.com --> <!--X-Head-End--> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <html> <head> <title>MUD-Dev message, [MUD-Dev] Re: META: who are we?</title> <!-- meta name="robots" content="noindex,nofollow" --> <link rev="made" href="mailto:pvirkkul#iki,fi"> </head> <body background="/backgrounds/paperback.gif" bgcolor="#ffffff" text="#000000" link="#0000FF" alink="#FF0000" vlink="#006000"> <font size="+4" color="#804040"> <strong><em>MUD-Dev<br>mailing list archive</em></strong> </font> <br> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] <br clear=all><hr> <!--X-Body-Begin--> <!--X-User-Header--> <!--X-User-Header-End--> <!--X-TopPNI--> Date: [ <a href="msg01112.html">Previous</a> | <a href="msg01114.html">Next</a> ] Thread: [ <a href="msg01112.html">Previous</a> | <a href="msg01380.html">Next</a> ] Index: [ <A HREF="author.html#01113">Author</A> | <A HREF="#01113">Date</A> | <A HREF="thread.html#01113">Thread</A> ] <!--X-TopPNI-End--> <!--X-MsgBody--> <!--X-Subject-Header-Begin--> <H1>[MUD-Dev] Re: META: who are we?</H1> <HR> <!--X-Subject-Header-End--> <!--X-Head-of-Message--> <UL> <LI><em>To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI> <LI><em>Subject</em>: [MUD-Dev] Re: META: who are we? </LI> <LI><em>From</em>: Petri Virkkula <<A HREF="mailto:pvirkkul#iki,fi">pvirkkul#iki,fi</A>></LI> <LI><em>Date</em>: Wed, 23 Sep 1998 04:19:35 +0300 (EEST)</LI> <LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI> </UL> <!--X-Head-of-Message-End--> <!--X-Head-Body-Sep-Begin--> <HR> <!--X-Head-Body-Sep-End--> <!--X-Body-of-Message--> <PRE> >>>>> "JCL" == J C Lawrence <claw#under,engr.sgi.com> writes: JCL> Ditto. I would that I had the time right now. My old question JCL> concerning lightweight locking supports is still out there JCL> (<A HREF="http://www.kanga.nu/~petidomo/lists/mud-dev/1998Q3/msg00467.html">http://www.kanga.nu/~petidomo/lists/mud-dev/1998Q3/msg00467.html</A>). JCL> I haven't had time to get much beyond that. I don't see why the virtualized semaphore idea wouldn't work if the implementation were slightly modified. See code below for detail how I suggest to be changed. As I see performance of the code below depends on value of MAX_LOCKS and implementation of HASH() and both can be modified based after you have studied the locking pattern of your code. Petri --- cut here --- typedef struct { pthread_mutex_t mutex; pthread_cond_t cond; } lock_entry_t; typedef struct { unsigned short is_locked; unsigned short sleeper_count; } lock_data_t; typedef struct { ... lock_data_t lock_data; ... } object_t; static lock_entry_t lock_table[MAX_LOCKS]; #define HASH(ptr, size, max) \ ((((unsigned long)(ptr)) / (size)) % (max)) void lock_object (object_t *ob) { unsigned int ix = HASH(ob, sizeof(object_t), MAX_LOCKS); pthread_mutex_lock (&lock_table[ix].mutex); while (ob->lock_data.is_locked) { ob->lock_data.sleeper_count++; pthread_cond_wait (&lock_table[ix].cond, &lock_table[ix].mutex); ob->lock_data.sleeper_count--; } ob->lock_data.is_locked = 1; pthread_mutex_unlock (&lock_table[ix].mutex); } void unlock_object (object_t *ob) { unsigned int ix = HASH(ob, sizeof(object_t), MAX_LOCKS); pthread_mutex_lock (&lock_table[ix].mutex); ob->lock_data.is_locked = 0; if (ob->lock_data.sleeper_count) pthread_cond_signal (&lock_table[ix].cond); pthread_mutex_unlock (&lock_table[ix].mutex); } --- cut here --- </PRE> <!--X-Body-of-Message-End--> <!--X-MsgBody-End--> <!--X-Follow-Ups--> <HR> <!--X-Follow-Ups-End--> <!--X-References--> <UL><LI><STRONG>References</STRONG>: <UL> <LI><STRONG><A NAME="01103" HREF="msg01103.html">[MUD-Dev] Re: META: who are we?</A></STRONG> <UL><LI><EM>From:</EM> Richard Woolcock <KaVir#dial,pipex.com></LI></UL></LI> <LI><STRONG><A NAME="01107" HREF="msg01107.html">[MUD-Dev] Re: META: who are we?</A></STRONG> <UL><LI><EM>From:</EM> J C Lawrence <claw#under,engr.sgi.com></LI></UL></LI> </UL></LI></UL> <!--X-References-End--> <!--X-BotPNI--> <UL> <LI>Prev by Date: <STRONG><A HREF="msg01112.html">[MUD-Dev] Re: META: who are we?</A></STRONG> </LI> <LI>Next by Date: <STRONG><A HREF="msg01114.html">[MUD-Dev] Re: META: who are we?</A></STRONG> </LI> <LI>Prev by thread: <STRONG><A HREF="msg01112.html">[MUD-Dev] Re: META: who are we?</A></STRONG> </LI> <LI>Next by thread: <STRONG><A HREF="msg01380.html">[MUD-Dev] Re: META: who are we?</A></STRONG> </LI> <LI>Index(es): <UL> <LI><A HREF="index.html#01113"><STRONG>Date</STRONG></A></LI> <LI><A HREF="thread.html#01113"><STRONG>Thread</STRONG></A></LI> </UL> </LI> </UL> <!--X-BotPNI-End--> <!--X-User-Footer--> <!--X-User-Footer-End--> <ul><li>Thread context: <BLOCKQUOTE><UL> <LI><STRONG>[MUD-Dev] Re: META: who are we?</STRONG>, <EM>(continued)</EM> <ul compact> <ul compact> <LI><strong><A NAME="01158" HREF="msg01158.html">[MUD-Dev] Re: META: who are we?</A></strong>, T. Alexander Popiel <a href="mailto:popiel#snugharbor,com">popiel#snugharbor,com</a>, Wed 23 Sep 1998, 20:44 GMT </LI> </ul> <LI><strong><A NAME="01103" HREF="msg01103.html">[MUD-Dev] Re: META: who are we?</A></strong>, Richard Woolcock <a href="mailto:KaVir#dial,pipex.com">KaVir#dial,pipex.com</a>, Tue 22 Sep 1998, 22:38 GMT <UL> <LI><strong><A NAME="01107" HREF="msg01107.html">[MUD-Dev] Re: META: who are we?</A></strong>, J C Lawrence <a href="mailto:claw#under,engr.sgi.com">claw#under,engr.sgi.com</a>, Tue 22 Sep 1998, 23:02 GMT <UL> <LI><strong><A NAME="01112" HREF="msg01112.html">[MUD-Dev] Re: META: who are we?</A></strong>, James Wilson <a href="mailto:jwilson#rochester,rr.com">jwilson#rochester,rr.com</a>, Wed 23 Sep 1998, 00:20 GMT </LI> <LI><strong><A NAME="01113" HREF="msg01113.html">[MUD-Dev] Re: META: who are we?</A></strong>, Petri Virkkula <a href="mailto:pvirkkul#iki,fi">pvirkkul#iki,fi</a>, Wed 23 Sep 1998, 01:19 GMT </LI> </UL> </LI> <LI><strong><A NAME="01380" HREF="msg01380.html">[MUD-Dev] Re: META: who are we?</A></strong>, Matt Chatterley <a href="mailto:chattemp#ee,port.ac.uk">chattemp#ee,port.ac.uk</a>, Wed 30 Sep 1998, 11:44 GMT </LI> </UL> </LI> <LI><strong><A NAME="01230" HREF="msg01230.html">[MUD-Dev] Re: META: who are we?</A></strong>, Marian Griffith <a href="mailto:gryphon#iaehv,nl">gryphon#iaehv,nl</a>, Fri 25 Sep 1998, 19:35 GMT <UL> <LI><strong><A NAME="01233" HREF="msg01233.html">[MUD-Dev] Re: META: who are we?</A></strong>, Holly Sommer <a href="mailto:hsommer#micro,ti.com">hsommer#micro,ti.com</a>, Fri 25 Sep 1998, 20:32 GMT </LI> </UL> </LI> <LI><strong><A NAME="01349" HREF="msg01349.html">[MUD-Dev] Re: META: who are we?</A></strong>, Marc Hernandez <a href="mailto:marc#jb,com">marc#jb,com</a>, Tue 29 Sep 1998, 05:50 GMT </LI> </ul> </LI> </UL></BLOCKQUOTE> </ul> <hr> <center> [ <a href="../">Other Periods</a> | <a href="../../">Other mailing lists</a> | <a href="/search.php3">Search</a> ] </center> <hr> </body> </html>